diff --git a/src/applications/people/storage/PhabricatorUser.php b/src/applications/people/storage/PhabricatorUser.php
--- a/src/applications/people/storage/PhabricatorUser.php
+++ b/src/applications/people/storage/PhabricatorUser.php
@@ -114,7 +114,7 @@
     return array(
       self::CONFIG_AUX_PHID => true,
       self::CONFIG_COLUMN_SCHEMA => array(
-        'userName' => 'text64',
+        'userName' => 'sort64',
         'realName' => 'text128',
         'sex' => 'text4?',
         'translation' => 'text64?',